ENTROPY OF ELECTROLYTES

The entropy of 1-1 and 2-2 model electrolytes is calculated from an ex pansion in terms of the multiparticle correlation functions; For elect rolytes, a simple truncation of this expansion is never sufficient for the accurate calculation of the entropy, even in the limit of low con centration, in marked contrast to the behavior for short-ranged potent ials. However, a partial, but infinite-order, summation of the expansi on is shown to yield both the correct low-concentration limit and exce llent results over a wide range of concentrations for both 1-1 and 2-2 electrolytes. The consequences of this result for some earlier applic ations of the entropy expansion to electrolytes are discussed.